Sample %³⁹Ar ³⁷Ar/³⁹Ar ³⁶Ar/³⁹Ar ⁴⁰Ar^*/³⁹Ar %⁴⁰Ar^* Age (Ma) SD

DMS89-132B (Sanidine / 41B)

3180-01 0.0100 0.00034 0.9170 89.9 9.767 0.063

3180-02 0.0240 0.00040 0.9418 88.7 10.031 0.069

3180-04 0.0136 0.00034 0.9453 90.2 10.068 0.069

3180-05 0.0106 0.00019 0.9721 94.4 10.353 0.066

3180-06 0.0128 0.00010 0.9817 97.0 10.454 0.072

Weighted Mean = 10.12 ± 0.03 SE

3180-03 0.0110 0.00023 1.3997 95.2 14.887 0.075

Irradiation Data

41B J = 0.005920 ± 0.0000090

61A J = 0.002847 ± 0.0000036

61B J = 0.002783 ± 0.0000024

98A J = 0.000478 ± 0.0000006